Malicious PDF — malware analysis report

Static analysis result for SHA-256 f809443e2bae3cad…

MALICIOUS

PDF

76.9 KB Created: 2021-03-31 09:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fd574108560b451fcc74067be8529caf SHA-1: 26722e6f0f01777c9f044c73b4e3dd3b20fc43db SHA-256: f809443e2bae3cad06d35ee7b1a80c3c31e001dc874ced7afe6a8d4c0b9b0a0e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a link farm, likely intended for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier also strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/award?keyword=antas+ng+wika+pdf PDF link annotation
    • http://tiwilofojifig.sportsontheweb.net/bsava_manual_of_canine_and_feline_dermatology.pdfIn PDF document text
    • https://cdn.sqhk.co/muzexeragod/jiNPjjr/80101534865.pdfIn PDF document text
    • https://cdn.sqhk.co/xusikeko/VghidV3/bivivuvejojolomolol.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/7418394.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/e42ff595.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/bihjd1Z/quest_diagnostics_portal_360.pdfIn PDF document text
    • https://cdn.sqhk.co/lalamiteliw/jjghjjc/korevadoga.pdfIn PDF document text
    • http://palogaza.sportsontheweb.net/photosynthesis_and_cellular_respiration_review.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/16732931994.pdfIn PDF document text
    • https://kinetatosutozi.weebly.com/uploads/1/3/2/7/132740742/3d280a3.pdfIn PDF document text
    • https://bevamiwe.weebly.com/uploads/1/3/0/7/130739198/70ec71ac63c.pdfIn PDF document text
    • http://riwuvodobopexu.mywebcommunity.org/conductores_aislantes_y_resistencias.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6904c0c-6ced-44d3-b01f-01126e1e993b/wusiwojena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc857478-5709-46b6-9d86-386a92a97250/2010_porsche_cayenne_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab25a9b7-4075-45b0-b4f5-30a616bda4b4/msi_970a-g43_plus_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a2c865-7cf7-449f-879a-ef2229610f15/83952161420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ef21e2-58ea-46ba-8e40-243f5245e459/kufipunujetupiladinobedib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df672a0-ffe7-432c-8a2a-d166bf1f7f85/vazoretemoripodepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f48877c5-eb08-40d3-adc9-e4adbc0e65a5/roxejenawetozep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2341f585-23b7-42c2-84fe-60aeb58f52c5/35247135628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/410c3886-3fe1-4447-a74d-981c6169b18e/what_is_the_best_diet_to_lose_fat_and_build_muscle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c36af389-0e10-4fe2-9fcd-6a495a78ffa7/sapazipimojilapale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d734da2-58ee-4bee-9530-3860a5580886/luputonazatevaxatofekov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 5228 bytes
SHA-256: 8989cf7d17564189551d81be84075f297b0ebbf26acb73d963d090d28e0877c7
font_01_sfnt_off00010026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10026 10584 bytes
SHA-256: e6a61306ed44e208a7134465bdc103aedef4c5433296ce7a1b883aa1baf36ec7